Struct js_sys::Uint32Array

source · [−]
#[repr(transparent)]
pub struct Uint32Array { /* private fields */ }
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Implementations

The Uint32Array() constructor creates a new array.

MDN documentation

An Uint32Array() which creates an array with an internal buffer large enough for length elements.

MDN documentation

An Uint32Array() which creates an array with the given buffer but is a view starting at byte_offset.

MDN documentation

An Uint32Array() which creates an array with the given buffer but is a view starting at byte_offset for length elements.

MDN documentation

The fill() method fills all the elements of an array from a start index to an end index with a static value. The end index is not included.

MDN documentation

The buffer accessor property represents the ArrayBuffer referenced by a TypedArray at construction time.

The subarray() method returns a new TypedArray on the same ArrayBuffer store and with the same element types as for this TypedArray object.

The slice() method returns a shallow copy of a portion of a typed array into a new typed array object. This method has the same algorithm as Array.prototype.slice().

The forEach() method executes a provided function once per array element. This method has the same algorithm as Array.prototype.forEach(). TypedArray is one of the typed array types here.

The length accessor property represents the length (in elements) of a typed array.

The byteLength accessor property represents the length (in bytes) of a typed array.

The byteOffset accessor property represents the offset (in bytes) of a typed array from the start of its ArrayBuffer.

The set() method stores multiple values in the typed array, reading input values from a specified array.

Gets the value at idx, equivalent to the javascript my_var = arr[idx].

Sets the value at idx, equivalent to the javascript arr[idx] = value.

Creates a JS typed array which is a view into wasm’s linear memory at the slice specified.

This function returns a new typed array which is a view into wasm’s memory. This view does not copy the underlying data.

Unsafety

Views into WebAssembly memory are only valid so long as the backing buffer isn’t resized in JS. Once this function is called any future calls to Box::new (or malloc of any form) may cause the returned value here to be invalidated. Use with caution!

Additionally the returned object can be safely mutated but the input slice isn’t guaranteed to be mutable.

Finally, the returned object is disconnected from the input slice’s lifetime, so there’s no guarantee that the data is read at the right time.

Creates a JS typed array which is a view into wasm’s linear memory at the specified pointer with specified length.

This function returns a new typed array which is a view into wasm’s memory. This view does not copy the underlying data.

Unsafety

Views into WebAssembly memory are only valid so long as the backing buffer isn’t resized in JS. Once this function is called any future calls to Box::new (or malloc of any form) may cause the returned value here to be invalidated. Use with caution!

Additionally the returned object can be safely mutated, the changes are guranteed to be reflected in the input array.

Copy the contents of this JS typed array into the destination Rust slice.

This function will efficiently copy the memory from a typed array into this wasm module’s own linear memory, initializing the memory destination provided.

Panics

This function will panic if this typed array’s length is different than the length of the provided dst array.

Copy the contents of the source Rust slice into this JS typed array.

This function will efficiently copy the memory from within the wasm module’s own linear memory to this typed array.

Panics

This function will panic if this typed array’s length is different than the length of the provided src array.

Efficiently copies the contents of this JS typed array into a new Vec.

Methods from Deref<Target = Object>

The constructor property returns a reference to the Object constructor function that created the instance object.

MDN documentation

The hasOwnProperty() method returns a boolean indicating whether the object has the specified property as its own property (as opposed to inheriting it).

MDN documentation

The isPrototypeOf() method checks if an object exists in another object’s prototype chain.

MDN documentation

The propertyIsEnumerable() method returns a Boolean indicating whether the specified property is enumerable.

MDN documentation

The toLocaleString() method returns a string representing the object. This method is meant to be overridden by derived objects for locale-specific purposes.

MDN documentation

The toString() method returns a string representing the object.

MDN documentation

The valueOf() method returns the primitive value of the specified object.

MDN documentation

Methods from Deref<Target = JsValue>

Returns the f64 value of this JS value if it’s an instance of a number.

If this JS value is not an instance of a number then this returns None.

Tests whether this JS value is a JS string.

If this JS value is a string value, this function copies the JS string value into wasm linear memory, encoded as UTF-8, and returns it as a Rust String.

To avoid the copying and re-encoding, consider the JsString::try_from() function from js-sys instead.

If this JS value is not an instance of a string or if it’s not valid utf-8 then this returns None.

UTF-16 vs UTF-8

JavaScript strings in general are encoded as UTF-16, but Rust strings are encoded as UTF-8. This can cause the Rust string to look a bit different than the JS string sometimes. For more details see the documentation about the str type which contains a few caveats about the encodings.

Returns the bool value of this JS value if it’s an instance of a boolean.

If this JS value is not an instance of a boolean then this returns None.

Tests whether this JS value is null

Tests whether this JS value is undefined

Tests whether the type of this JS value is symbol

Tests whether typeof self == "object" && self !== null.

Tests whether the type of this JS value is function.

Tests whether the value is “truthy”.

Tests whether the value is “falsy”.

Trait Implementations

Performs the conversion.

Performs the conversion.

Performs the conversion.

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

Returns the “default value” for a type. Read more

The resulting type after dereferencing.

Dereferences the value.

Performs the conversion.

Performs the conversion.

Performs the conversion.

Performs the conversion.

The wasm ABI type that this converts from when coming back out from the ABI boundary. Read more

Recover a Self from Self::Abi. Read more

The wasm ABI type that this converts into when crossing the ABI boundary. Read more

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary. Read more

The wasm ABI type that this converts into when crossing the ABI boundary. Read more

Convert self into Self::Abi so that it can be sent across the wasm ABI boundary. Read more

Performs a dynamic instanceof check to see whether the JsValue provided is an instance of this type. Read more

Performs a zero-cost unchecked conversion from a JsValue into an instance of Self Read more

Performs a zero-cost unchecked conversion from a &JsValue into an instance of &Self. Read more

Test whether this JS value has a type T. Read more

Performs a dynamic cast (checked at runtime) of this value into the target type T. Read more

Performs a dynamic cast (checked at runtime) of this value into the target type T. Read more

Performs a zero-cost unchecked cast into the specified type. Read more

Performs a zero-cost unchecked cast into a reference to the specified type. Read more

Test whether this JS value is an instance of the type T. Read more

Performs a dynamic check to see whether the JsValue provided is a value of this type. Read more

Tests whether the argument is a “none” instance. If so it will be deserialized as None, and otherwise it will be passed to FromWasmAbi. Read more

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option. Read more

Returns an ABI instance indicating “none”, which JS will interpret as the None branch of this option. Read more

The wasm ABI type references to Self are recovered from.

The type that holds the reference to Self for the duration of the invocation of the function that has an &Self parameter. This is required to ensure that the lifetimes don’t persist beyond one function call, and so that they remain anonymous. Read more

Recover a Self::Anchor from Self::Abi. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Same as IntoWasmAbi::Abi

Same as IntoWasmAbi::into_abi, except that it may throw and never return in the case of Err. Read more

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

🔬 This is a nightly-only experimental API. (toowned_clone_into)

Uses borrowed data to replace owned data, usually by cloning. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.